Supplemental Figure 4 Sensitivity analyses of model simulations
were performed by holding all other inputs constant and varying only the
parameter of interest. The dark blue line is the model results with the
default parameters, observations are shown in gray, and the light blue
uncertainty bounds reflect the model results from varying DIC of the
deep ocean (1.7-2.7 mol/kg) (A), DIC of the EUC (2.0-2.1 mol/kg) (B),
pre-bomb radiocarbon levels in the deep ocean (-110‰ to -80‰) (C),
mixed-layer depth (15-50m) (D), and surface biological uptake
(8x10-5molC/m3/day-8x10-3molC/m3/day)
(E).